Home
Search results “Entangled photons quantum cryptography photons”
Quantum cryptography, animated
 
01:58
This animation by the Centre for Quantum Technologies at the National University of Singapore illustrates the process of quantum key distribution using entangled photons. The goal is for two people in different places to end up with identical keys by measuring these photons. We want these people - usually given the names Alice and Bob - to have a random sequence of 1s and 0s that they can use to scramble (and then unscramble) a message. The presence of entanglement between the photons means that any snooping will be revealed. Note: this animation has no sound. See also our video series on cryptography: https://www.youtube.com/playlist?list=PL4CHL5j4XhurVKJz16Qg6qj0toMHyLh7q
Can you make quantum entangled photons using garbage and fertilizer? Probably.
 
14:24
Quantum entanglement is one of the weirdest physical phenomena. If you take 2 linked particles and mess with 1 of them, no matter how far away it's partner is, it will also be instantly affected. But making entangled particles isn't magic, nor does it require a super expensive and complicated machine. All that's required is a laser, a non linear crystal and a bit of ingenuity. And all of that can be made out of garbage. In this video we built a simple DIY laser called a TEA laser, and shoot it through a crystal made of a common fertilizer to produce some entangled photons. The trick though is detected those photons and our first attempt was a failure. But with the groundwork laid, we can iterate and improve until we confirm the measurement. So it's not that the photons weren't produced, they almost certainly were. Just so few were captured by my camera they were obscured by noise. Resources: DPSS/Second Harmonic: https://www.youtube.com/watch?v=sF2RDJISnAs Double Slit/Interferometer: https://www.youtube.com/watch?v=VvdnZn2GDVw Plancks constant: https://www.youtube.com/watch?v=q0jLUpBqess Styropryos video: https://www.youtube.com/watch?v=1psxE4NlECQ RImstars video: https://www.youtube.com/watch?v=v9sKqGC3t-0 Parts: Transformer: https://amzn.to/2uiSztG Rotary cutter: https://amzn.to/2ufOo1W Lamination sheets: https://amzn.to/2zED0Su ____________________________________________________________________ _________________________________________________________________ Patreon: https://www.patreon.com/thethoughtemporium Store: https://www.redbubble.com/people/chironex/shop _________________________________________________________________ My Social Media Pages: Instagram: https://www.instagram.com/thethoughtemporium/ Facebook: https://www.facebook.com/thethoughtemporium/ Twitter: https://www.twitter.com/TTEchironex Website: http://thethoughtemporium.com/ _________________________________________________________________ As always, thanks to my awesome Patrons for helping to make these video possible. Special thanks to: -Anatoly Bazarov -Bill Russell -John De Witt -Terry Fuller -Anatoly Bazarov -Rauni -Ben Davis -Alexandre Guhur -Ben Krasnow -Michael Gregg -Daniel Henneberger -Paul Richmond -Jim Mussared -Pedro Blanc Arabe -Ryan Whited -kn0tsin -Morten Eriksen -BioQuisitive -Patryk Wycech -Al Dass -Larry -Michael Chatzidakis -Oliver -Justin Hendryx -orotusso -Alex Lemna -Cataract Bumblesnatch -Anita Fowler -Besenyeim -Narvurtar1324 -Alexandre Castlenine -Kevin Comerford -Kolvenik -Ben reay -Arnis Alexander Halbleib
Views: 153480 The Thought Emporium
Quantum Entanglement & Spooky Action at a Distance
 
09:16
Does quantum entanglement make faster-than-light communication possible? What is NOT random? http://bit.ly/NOTrandoVe First, I know this video is not easy to understand. Thank you for taking the time to attempt to understand it. I've been working on this for over six months over which time my understanding has improved. Quantum entanglement and spooky action at a distance are still debated by professors of quantum physics (I know because I discussed this topic with two of them). Does hidden information (called hidden variables by physicists) exist? If it does, the experiment violating Bell inequalities indicates that hidden variables must update faster than light - they would be considered 'non-local'. On the other hand if you don't consider the spins before you make the measurement then you could simply say hidden variables don't exist and whenever you measure spins in the same direction you always get opposite results, which makes sense since angular momentum must be conserved in the universe. Everyone agrees that quantum entanglement does not allow information to be transmitted faster that light. There is no action either detector operator could take to signal the other one - regardless of the choice of measurement direction, the measured spins are random with 50/50 probability of up/down. Special thanks to: Prof. Stephen Bartlett, University of Sydney: http://bit.ly/1xSosoJ Prof. John Preskill, Caltech: http://bit.ly/1y8mJut Looking Glass Universe: http://bit.ly/17zZH7l Physics Girl: http://bit.ly/PhysGirl MinutePhysics: http://bit.ly/MinPhys Community Channel: http://bit.ly/CommChannel Nigel, Helen, Luke, and Simon for comments on earlier drafts of this video. Filmed in part by Scott Lewis: http://google.com/+scottlewis Music by Amarante "One Last Time": http://bit.ly/VeAmarante
Views: 2482112 Veritasium
Can Quantum Codes Really Be Unbreakable?
 
03:07
Thanks to the laws of physics—specifically quantum entanglement—quantum cryptography promises to deliver unbreakable codes. Quantum physicist Artur Ekert explains how. Watch the full program here: https://youtu.be/HWb0y5gY590 Original Program Date: May 31, 2015 Subscribe to our YouTube Channel for all the latest from WSF. Visit our Website: http://www.worldsciencefestival.com/ Like us on Facebook: https://www.facebook.com/worldsciencefestival Follow us on twitter: https://twitter.com/WorldSciFest
Views: 18419 World Science Festival
Shanni Prutchi Construction of an Entangled Photon Source
 
12:57
Hackaday Superconference // Nov 14-15 // Dogpatch Studios // San Francisco Shanni Prutchi is studying the uses of Quantum Entanglement and explains how she built and uses a Entangled Photon Source. Once two entangled particles are identified, they can be used for Quantum Teleportation and Quantum Key Cryptography. Both are explain in her talk which was presented at the 2015 Hackaday SuperConference Read the article that accompanies this video: http://hackaday.com/2015/11/30/uses-for-quantum-entanglement-with-shanni-prutchi/ Check out Shanni Prutchi's webpage and follow her on Twitter: http://www.prutchi.com/ https://twitter.com/shannirosa Learn about the Hackaday SuperConference: https://hackaday.io/superconference/
Views: 16890 HACKADAY
Quantum Teleportation Is Real, Here's How It Works
 
03:52
Scientists successfully achieved earth-to-space quantum teleportation, but what exactly does that mean? How Quantum Computing Will Change The World! - https://youtu.be/3BKIJCTLy-s Read More: Teleportation: Photon particles today, humans tomorrow? http://www.bbc.co.uk/news/science-environment-40594387 “Chinese scientists say they have "teleported" a photon particle from the ground to a satellite orbiting 1,400km (870 miles) away. For many, however, teleportation evokes something much more exotic. Is a world previously confined to science fiction now becoming reality? Well, sort of. But we are not likely to be beaming ourselves to the office or a beach in the Bahamas anytime soon. Sorry.” China Demonstrates First Intercontinental Quantum Communication https://www.seeker.com/tech/china-demonstrates-first-intercontinental-quantum-communication “The first public demonstration of long distance quantum communication came a few weeks after China unveiled a new 1,240-mile-long optic-fiber quantum communication network between Beijing and Shanghai for the “military, finance, and government affairs fields.” In May, Chinese researchers announced a new quantum computer that they claimed was 24,000 times faster than competing designs, too.” Quantum Data Storage in a Single Atom Brings New Computing Era Closer to Reality https://www.seeker.com/tech/quantum-data-storage-in-a-single-atom-brings-new-computing-era-closer-to-reality “We’re on the verge of a quantum computing revolution. Entirely new devices will replace tiny transistors on silicon chips with atomic-scale processors capable of executing exponentially more calculations per second than today’s biggest and fastest supercomputers.” ____________________ Seeker inspires us to see the world through the lens of science and evokes a sense of curiosity, optimism and adventure. Visit the Seeker website http://www.seeker.com/shows/?utm_source=youtube&utm_medium=social&utm_campaign=seeker Subscribe now! http://www.youtube.com/subscription_center?add_user=dnewschannel Seeker on Twitter http://twitter.com/seeker Trace Dominguez on Twitter https://twitter.com/tracedominguez Seeker on Facebook https://www.facebook.com/SeekerMedia/ Seeker http://www.seeker.com/ Special Thanks to Trace Dominguez for hosting and writing this episode of Seeker!
Views: 725217 Seeker
Quantum cryptography for space (part 2)
 
01:21
Dive into the CQT device - the Small Photon Entangling Quantum Source (SPEQS) - to see how it creates entangled photons. Learn more about the work of Dr Alexander Ling at the Centre for Quantum Technologies in Singapore: http://quantumlah.org/AlexLinggroup
Quantum Communication satellite Micius sends entangled photons to stations 1200 km apart - TomoNews
 
06:56
BEIJING — China is leading the pack in terms of quantum space experiments after the country announced that setting a new distance record for beaming entangled particles from space to Earth. The experiment was conducted from the Quantum Experiments at Space Scale (QUESS) satellite, nicknamed Micius, in reference to a fifth century B.C. Chinese philosopher. It is believed photons travel more smoothly in the near-vacuum of space. Quantum communication relies on a phenomenon known as quantum entanglement, in which particles influence each other, even when separated by great distances. A photon can be split into pairs of entangled photons by a laser beam. The entangled photons influence one another, so that if one photon changes its state, the other reacts instantly by taking up a state relative to the photon. The photons remain entangled even when one is far away. Quantum communication could greatly enhance security, as any interception of the information will necessarily alter the state of the photons, thus giving away the eavesdropper. According to Science, the team produced entangled photons by sending a laser beam through a light-altering crystal onboard the satellite. The photons were sent to two receiving stations in Delingha and Lijiang, 1,200 km apart. Opposite polarization states were measured at the two stations, confirming the entanglement — otherwise known as “spooky action” — was achieved over a record distance. ----------------------------------------­--------------------- Go to https://www.patreon.com/tomonews and become a Patron now TomoNews is now on Patreon and we've got some cool perks for our hardcore fans. TomoNews is your best source for real news. We cover the funniest, craziest and most talked-about stories on the internet. Our tone is irreverent and unapologetic. If you’re laughing, we’re laughing. If you’re outraged, we’re outraged. We tell it like it is. And because we can animate stories, TomoNews brings you news like you’ve never seen before. Visit our official website for all the latest, uncensored videos: http://us.tomonews.com Check out our Android app: http://bit.ly/1rddhCj Check out our iOS app: http://bit.ly/1gO3z1f Get top stories delivered to your inbox everyday: http://bit.ly/tomo-newsletter See a story that should be animated? Tell us about it! Suggest a story here: http://bit.ly/suggest-tomonews Stay connected with us here: Facebook http://www.facebook.com/TomoNewsUS Twitter @tomonewsus http://www.twitter.com/TomoNewsUS Google+ http://plus.google.com/+TomoNewsUS/ Instagram @tomonewsus http://instagram.com/tomonewsus
Views: 5779 TomoNews Sci & Tech
Colloquium: Saikat Guha - Photonic quantum computing and applications
 
59:24
Title: Photonic quantum computing and applications Abstract(s): In the cluster model of quantum computing, any quantum algorithm can be implemented by an adaptive sequence of measurements at the nodes of a graph, where the nodes are qubits (photons in our case) and edges between two nodes represent entanglement. An entangled cluster in a 2D square lattice topology is known to a resource for universal quantum computing. Photons are a promising candidate for encoding qubits scalably but assembling a large photonic entangled cluster state (using photons and linear optical circuits) is a challenge, since each step relies on probabilistic operations, and losses in transmission and detection. I will describe a new proposal for cluster-model photonic quantum computing that combines ideas from recent work on "boosted" linear optics based Bell basis measurements, percolation theory and quantum error correction for photon loss. In this architecture, small photonic clusters are fused in an efficient “ballistic" fashion, i.e., without any detection-induced feedback, into a long sheet of entangled photons, which can then be re-cast into a logical square-lattice graph for quantum computing. Aside from the obvious uses in general-purpose quantum computing, I will talk about applications of photonic cluster states to a special purpose quantum processor known as quantum repeater, which will be a key enabler to a future quantum internet. Speaker Bio(s): Saikat Guha is an Associate Professor of Optical Sciences at the University of Arizona. He earned his B.Tech. degree in electrical engineering in 2002 from the Indian Institute of Technology Kanpur (India), followed by S.M. and Ph.D. degrees in 2004 and 2008 respectively, from the department of electrical engineering and computer science at the Massachusetts Institute of Technology. His research interests span quantum limits to optical communication and sensing, optical quantum computing, and network information theory. Guha represented India at the International Physics Olympiad in 1998, where he was awarded the European Physical Society award for the experimental component. He was a co-recipient of a NASA Tech Brief award in 2010 in recognition of his work on novel receivers for quantum imaging. His Defense Advanced Research Projects Agency Information in a Photon team won the Raytheon 2011 Excellence in Engineering and Technology Award, Raytheon's highest technical honor, for outstanding research on fundamental limits of optical communication.
Views: 668 UA OSC
Bell's Theorem: The Quantum Venn Diagram Paradox
 
17:35
Featuring 3Blue1Brown Watch the 2nd video on 3Blue1Brown here: https://www.youtube.com/watch?v=MzRCDLre1b4 Support MinutePhysics on Patreon! http://www.patreon.com/minutephysics Link to Patreon Supporters: http://www.minutephysics.com/supporters/ This video is about Bell's Theorem, one of the most fascinating results in 20th century physics. Even though Albert Einstein (together with collaborators in the EPR Paradox paper) wanted to show that quantum mechanics must be incomplete because it was nonlocal (he didn't like "spooky action at a distance"), John Bell managed to prove that any local real hidden variable theory would have to satisfy certain simple statistical properties that quantum mechanical experiments (and the theory that describes them) violate. Since then, GHZ and others have managed to extend the theoretical work, and Alain Aspect performed the first Bell test experiment in the late 1980s. Thanks to Vince Rubinetti for the music: https://soundcloud.com/vincerubinetti/one-two-zeta And thanks to Evan Miyazono, Aatish Bhatia, and Jasper Palfree for discussions and camaraderie during some of the inception of this video. REFERENCES: John Bell's Original Paper: http://inspirehep.net/record/31657/files/vol1p195-200_001.pdf Quantum Theory and Reality: https://www.scientificamerican.com/media/pdf/197911_0158.pdf "What Bell Did" By Tim Maudlin: https://arxiv.org/pdf/1408.1826 Bell's Theorem on Wikipedia: https://en.wikipedia.org/wiki/Bell%27s_theorem 2015 experimental confirmation that QM violates Bell's theorem: https://arxiv.org/pdf/1508.05949.pdf https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.250402 Bell's Theorem without Inequalities (GHZ): http://dx.doi.org/10.1119/1.16243 Kochen-Specker Theorem: https://en.wikipedia.org/wiki/Kochen–Specker_theorem MinutePhysics is on twitter - @minutephysics And facebook - http://facebook.com/minutephysics And Google+ (does anyone use this any more?) - http://bit.ly/qzEwc6 Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich
Views: 4193694 minutephysics
How to Teleport Schrödinger's Cat
 
14:13
Support me on Patreon: http://www.patreon.com/minutephysics Previous video on No Cloning: https://youtu.be/owPC60Ue0BE How to teleport Schrödinger’s cat: this video presents the full quantum teleportation procedure, in which an arbitrary qubit (spin, etc) is teleported from Alice to Bob by way of a pair of particles entangled in a bell (EPR) state and the transmission of information via a classical channel. Thanks to everyone who supports MinutePhysics on Patreon! Link to Patreon supporters here: http://www.minutephysics.com/supporters.html REFERENCES: No Cloning video: https://youtu.be/owPC60Ue0BE The No-Cloning Theorem: https://en.wikipedia.org/wiki/No-cloning_theorem MinutePhysics on Schrödinger’s Cat: https://www.youtube.com/watch?v=IOYyCHGWJq4 The History of Schrödinger’s (& Einstein’s) Cat: http://nautil.us/issue/41/selection/how-einstein-and-schrdinger-conspired-to-kill-a-cat Original Quantum Teleportation Paper: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.46.9405 Wikipedia on Quantum Teleportation: https://en.wikipedia.org/wiki/Quantum_teleportation Calcium ion teleportation: http://www.nature.com/nature/journal/v429/n6993/abs/nature02570.html Teleporting a 2-qubit state: https://arxiv.org/abs/quant-ph/0407219v3 Multi-level teleportation: https://arxiv.org/abs/quant-ph/0106018v2 Scott Aaronson blog post on Teleportation (& Free Will, etc): http://www.scottaaronson.com/democritus/lec18.html Classical Teleportation: https://arxiv.org/abs/quant-ph/0107082 Blog post on quantum vs classical teleportation: https://marozols.wordpress.com/2012/05/23/three-myths-about-quantum-computing-part-3/ MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich Music by Nathaniel Schroeder
Views: 1546812 minutephysics
Quantum entanglement imaging
 
06:17
Quantum entanglement imaging, podcast by Nature Links: The paper at Nature: http://www.nature.com/nature/journal/v512/n7515/full/nature13586.html Article at Scientific American: http://www.scientificamerican.com/article/entangled-photons-make-a-picture-from-a-paradox/ There is also an article at National Geographic: http://news.nationalgeographic.com/news/2014/08/140827-quantum-imaging-cats-undetected-photon-science
Views: 9872 funestis
Quantum Optics – One photon polarization as a qubit
 
15:21
One-photon based quantum technologies In this lesson, you will discover two quantum technologies based on one photon sources. Quantum technologies allow one to achieve a goal in a way qualitatively different from a classical technology aiming at the same goal. For instance, quantum cryptography is immune to progress in computers power, while many classical cryptography methods can in principle be broken when we have more powerful computers. Similarly, quantum random number generators yield true random numbers, while classical random number generators only produce pseudo-random numbers, which might be guessed by somebody else than the user. This lesson is also an opportunity to learn two important concepts in quantum information: (i) qubits based on photon polarization; (ii) the celebrated no-cloning theorem, at the root of the security of quantum cryptography. Learning Objectives • Apply your knowledge about the behavior of a single photon on a beam splitter to quantum random number generators. • Understand the no-cloning theorem • Understand and remember the properties of q qubit This course gives you access to basic tools and concepts to understand research articles and books on modern quantum optics. You will learn about quantization of light, formalism to describe quantum states of light without any classical analogue, and observables allowing one to demonstrate typical quantum properties of these states. These tools will be applied to the emblematic case of a one-photon wave packet, which behaves both as a particle and a wave. Wave-particle duality is a great quantum mystery in the words of Richard Feynman. You will be able to fully appreciate real experiments demonstrating wave-particle duality for a single photon, and applications to quantum technologies based on single photon sources, which are now commercially available. The tools presented in this course will be widely used in our second quantum optics course, which will present more advanced topics such as entanglement, interaction of quantized light with matter, squeezed light, etc... So if you have a good knowledge in basic quantum mechanics and classical electromagnetism, but always wanted to know: • how to go from classical electromagnetism to quantized radiation, • how the concept of photon emerges, • how a unified formalism is able to describe apparently contradictory behaviors observed in quantum optics labs, • how creative physicists and engineers have invented totally new technologies based on quantum properties of light, then this course is for you. Subscribe at: https://www.coursera.org
Views: 851 intrigano
Quantum Teleportation From Space Achieved by China!
 
09:46
Use the ColdFusion link, http://www.audible.com/coldfusion, to get a free audio book and 30day trial! Subscribe here: https://goo.gl/9FS8uF Video animations by Beeple:http://www.beeple-crap.com/vjclips.php Become a Patreon!: https://www.patreon.com/ColdFusion_TV Hi, welcome to ColdFusion (formerly known as ColdfusTion). Experience the cutting edge of the world around us in a fun relaxed atmosphere. Sources: Paper explaining entanglement: https://arxiv.org/ftp/arxiv/papers/1402/1402.4764.pdf http://www.nature.com/nature/journal/vaap/ncurrent/full/nature23675.html?foxtrotcallback=true https://www.inverse.com/article/34027-quantum-teleportation-entanglement-computing-internet-china https://www.inverse.com/article/33039-quantum-entanglement-chinese-micius-space http://www.abc.net.au/news/science/2017-06-16/chinese-satellite-breaks-quantum-entanglement-distance-record/8620240 http://www.dailymail.co.uk/sciencetech/article-4686720/China-teleports-photon-SPACE.html http://english.cas.cn/newsroom/news/201708/t20170810_181863.shtml https://journals.aps.org/pr/pdf/10.1103/PhysRev.47.777 Satellite launch: https://www.youtube.com/watch?v=p8rj2xgolAY Entanglement Documentary (1985): https://www.youtube.com/watch?v=BFvJOZ51tmc //Soundtrack// 0:00 -papercutz - Rivers (Synkro Remix) 0:34 Slow Meadow - Hananel's Recovery 1:44 Deccies - Subtles 5:24 Nils Frahm – You 7:30 Swoof - Waves 9:13 Redstar vs Tritonal - The Problem is Still With Me (Falcon Mashup) » Google + | http://www.google.com/+coldfustion » Facebook | https://www.facebook.com/ColdFusionTV » My music | http://burnwater.bandcamp.com or » http://www.soundcloud.com/burnwater » https://www.patreon.com/ColdFusion_TV » Collection of music used in videos: https://www.youtube.com/watch?v=YOrJJKW31OA Producer: Dagogo Altraide » Twitter | @ColdFusion_TV This video contains a paid promotion
Views: 643857 ColdFusion
What is a quantum computer? (QuantumCasts)
 
10:54
In this video, Marissa Giustina addresses some basic questions about quantum computing. You’ll learn about what makes a quantum computer “quantum”, and what differentiates it from a regular computer. In addition, you’ll get to see what Google’s current quantum processors look like, and see the stack of hardware infrastructure needed to run the full system. Learn more about the Google AI Quantum team → http://bit.ly/2DnvKLy QuantumCasts playlist → http://bit.ly/2Pw0xay Subscribe to the TensorFlow YouTube channel → http://bit.ly/TensorFlow1
Views: 23457 TensorFlow
Quantum Entanglement: Producing Entangled Photon Pairs
 
01:25:05
Quantum Entanglement: Producing Entangled Photon Pairs Shanni Prutchi Lindsey Andrews Talk Documentation Monday, February 19, 2018 Organized by Amalle Dublon & Constantina Zavitsanos in conjunction with the exhibition "Coop Fund, Amalle Dublon & Constantina Zavitsanos, Devin Kenny, John Neff" (February 11 – March 31, 2018) http://artistsspace.org/materials/quantum-entanglement
Views: 556 Artists Space
Chinese Scientists Make Breakthrough in Quantum Computing Technology
 
02:15
Chinese scientists have successfully entangled 18 optical quantum bits, a key achievement that will dramatically promote quantum computing speed. A group of Chinese scientists for the first time entangled as many as 18 quantum bits by adopting a new technology called the multi-degrees of freedom photon control method. http://www.cctvplus.com/news/20180703/8084580.shtml#!language=1 Welcome to subscribe us on: Facebook: https://www.facebook.com/NewsContent.CCTVPLUS Twitter: https://twitter.com/CCTV_Plus LinkedIn: https://www.linkedin.com/company/cctv-news-content Instagram: https://www.instagram.com/cctvnewscontent/ Video on Demand: www.cctvplus.com If you are in demand of this video footage, please contact with our business development team via email: [email protected]
The Quantum Experiment that Broke Reality | Space Time | PBS Digital Studios
 
13:32
The double slit experiment radically changed the way we understand reality. To check out any of the lectures available from The Great Courses Plus go to http://ow.ly/QVaz302duhX and get ready to learn about everything from cooking to calculus. Get your own Space Time t­shirt at http://bit.ly/1QlzoBi Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g The double slit experiment radically changed the way we understand reality. Find out what the ramifications of this experiment were and how we can use it to better comprehend our universe. Written and hosted by Matt O’Dowd Made by Kornhaber Brown (www.kornhaberbrown.com) Previous Episode https://www.youtube.com/watch?v=eJ2RNBAFLj0 The Planck Length and the Origin of Quantum Mechanics https://www.youtube.com/watch?v=tQSbms5MDvY Veritasium and the Double Slit Experiment https://www.youtube.com/watch?v=GzbKb59my3U Is Quantum Tunneling Faster than Light? https://www.youtube.com/watch?v=-IfmgyXs7z8 Comments by: Jason Blank https://www.youtube.com/watch?v=_NqbRcwWwPw&lc=z13mhf0rcurtybftb23nf3yalruqvx2dm Deisisase https://www.youtube.com/watch?v=_NqbRcwWwPw&lc=z13uifuzxlr3xvc1022ly1jo4uijfjhgj04 Bike Jake https://www.youtube.com/watch?v=_NqbRcwWwPw&lc=z13mcnhbglncgpbc122wgxsabw31xdvqw04 An Imposter https://www.youtube.com/watch?v=_NqbRcwWwPw&lc=z12hyl5z4lvsjdihn04cgbhbsnnivhbgdqw0k
Views: 3582857 PBS Space Time
Photon efficient quantum key distribution using time–energy entanglement with high dimensional encod
 
04:02
Video abstract for the article ‘Photon-efficient quantum key distribution using time–energy entanglement with high-dimensional encoding‘ by Tian Zhong et al (Tian Zhong et al 2015 New J. Phys. 17 022002). Read the full article in New Journal of Physics http://iopscience.iop.org/1367-2630/17/2/022002
Views: 242 NewJournalofPhysics
Fascinating world of photons, superposition and entanglement by Urbasi Sinha
 
01:40:48
Kaapi with Kuriosity Fascinating world of photons, superposition and entanglement by Urbasi Sinha (Quantum Information and Computing (QuIC) laboratory at Raman Research Institute, Bengaluru) 4pm to 6pm Sunday, 25 February 2018 J. N. Planetarium, Sri T. Chowdaiah Road, High Grounds, Bangalore Quantum mechanics is a cornerstone of modern physics. Just as the 19th century was called the Machine Age and the 20th century the Information Age, the 21st century promises to go down in history as the Quantum Age. In this talk, I will discuss key properties of quantum systems called Quantum Superposition and Quantum Entanglement. I will discuss the world of single and entangled photons and also discuss ongoing work towards quantum technology in our Quantum Information and Computing lab at the Raman Research Institute, Bengaluru. https://icts.res.in/outreach/kaapi-with-kuriosity/fascinating-world-photons-superposition-and-entanglement
Quantum Key Distribution in ICS
 
33:00
Quantum Key Distribution (QKD) is based on physics rather than classic information theory. You get a quick, easily understood lesson on entangled photons, happy and sad photons that are truly random, not pseudo-random. The photons can be "random and correlated over a great distance". It's not just theory; it's being tested at SDG&E. Duncan Earl discusses the theory of QKD, and then Adam Crain talks about how this can be used for key distribution in an ICS protocol, using SSP-21 as an example.
Views: 229 S4 Events
Quantum Cryptography Explained
 
08:13
This episode is brought to you by Squarespace: http://www.squarespace.com/physicsgirl With recent high-profile security decryption cases, encryption is more important than ever. Much of your browser usage and your smartphone data is encrypted. But what does that process actually entail? And when computers get smarter and faster due to advances in quantum physics, how will encryption keep up? http://physicsgirl.org/ ‪http://twitter.com/thephysicsgirl ‪http://facebook.com/thephysicsgirl ‪http://instagram.com/thephysicsgirl http://physicsgirl.org/ Help us translate our videos! http://www.youtube.com/timedtext_cs_panel?c=UC7DdEm33SyaTDtWYGO2CwdA&tab=2 Creator/Editor: Dianna Cowern Writer: Sophia Chen Animator: Kyle Norby Special thanks to Nathan Lysne Source: http://gva.noekeon.org/QCandSKD/QCand... http://physicsworld.com/cws/article/n... https://epic.org/crypto/export_contro... http://fas.org/irp/offdocs/eo_crypt_9... Music: APM and YouTube
Views: 279023 Physics Girl
Quantum Cryptography In Space
 
13:00
I've had a lot of requests to cover the recent announcement that a Chinese research team has successfully delivered entangle photon pairs to locations separated 1000km. The press and speculation has been a little misleading so here's my explanation of how this works and what it means. This video is my second attempt - here' my original voiceover without graphics for those who are curious. https://www.youtube.com/watch?v=CfInxdjWRZA
Views: 48149 Scott Manley
Quantum Computing Concepts – Entanglement
 
03:23
Please watch: "UNSWTV: Entertaining your curiosity" https://www.youtube.com/watch?v=bQ7UO8nxiL0 -~-~~-~~~-~~-~- Among all the peculiar phenomena encountered in the quantum realm, entanglement is perhaps the most striking one, the most distant from our daily experience. At the same time, entanglement constitutes a precious resource for quantum information. In this episode of Quantum Computing Concepts, Professor Andrea Morello of UNSW Australia explains what quantum entanglement is, and shows how to create it using a pair of spins. SUBSCRIBE now to UNSWTV: http://www.youtube.com/user/unsw?sub_confirmation=1 UNSWTV is the official channel of UNSW Australia, a university based in Sydney but with a global footprint. Short-form factual content exploring the way the world works. Feed your thirst for knowledge. For more information: www.unsw.edu.au https://www.facebook.com/unsw Twitter @unswtv
Views: 12434 UNSW
Amazing World of Quantum Entanglement - Full Documentary
 
52:58
Einstein called it “spooky action at a distance,” but today quantum entanglement is poised to revolutionize technology from computers to cryptography. Physicists have gradually become convinced that the phenomenon—two subatomic particles that mirror changes in each other instantaneously over any distance—is real. But a few doubts remain. NOVA follows a ground-breaking experiment in the Canary Islands to use quasars at opposite ends of the universe to once and for all settle remaining questions. Scientists are working to decipher and harness the power of quantum mechanics, but the strange nature of entanglement and other quantum phenomena continues to confound researchers, posing new and mystifying questions. From an experiment studying quasars at opposite ends of the universe to probing the interactions of elementary particles, researchers are gathering insights that could shatter the laws of space and time and provide a radical new understanding of the universe. This documentary presents cutting-edge work and considers various implications of the coming quantum revolution that begins with making sense of the seemingly absurd. By entangling particles on a satellite and shooting them down to Earth, China may have just set the tone for a global “quantum space race.” In a new study in the journal Science, Jian-Wei Pan, a physicist at the University of Science and Technology of China in Shanghai, and his colleagues report that they were able to entangle photons aboard a satellite 300 miles above Earth and then beam those particles to three ground stations across China—each separated by more than 700 miles. It’s an unprecedented feat. Not only were the particles entangled in space (scientists have never done this before), but they retained their bizarre connection even after they’d been separated by a distance 10 times the previous record for what’s called “quantum teleportation.” Entanglement still boggles physicists’ minds to this day, even though our understanding of it has its origins in the renaissance of early 20th-century quantum theory research. According to quantum mechanics, particles can be in different “states” at once, and when they’re observed, those superimposed states collapse into just one. When particles are “entangled,” their states are linked together across space—when the one particle is measured, the other particle’s properties become frozen as well. Einstein wasn’t a fan of this idea because it suggested that communication between particles could travel instantaneously—i.e., faster than the speed of light. Though it sounds like a pointless exercise to make “twin” particles and send them careening away from each other, scientists are doing just that in order to pioneer what’s called “quantum communication,” an ultra-private way of sending messages. Because observation of one entangled particle immediately affects its partner, information sent via quantum methods can’t be hacked without it being very obvious to the other party involved.
Views: 2861 Wisdom Land
New method of quantum entanglement vastly increases how much information can be carried in a photon
 
02:47
A team of researchers led by UCLA electrical engineers has demonstrated a new way to harness light particles, or photons, that are connected to each other and act in unison no matter how far apart they are —a phenomenon known as quantum entanglement. In previous studies, photons have typically been entangled by one dimension of their quantum properties—usually the direction of their polarization. In the new study, researchers demonstrated that they could slice up and entangle each photon pair into multiple dimensions using quantum properties such as the photons' energy and spin. This method, called hyperentanglement, allows each photon pair to carry much more data than was possible with previous methods. Quantum entanglement could allow users to send data through a network and know immediately whether that data had made it to its destination without being intercepted or altered. With hyperentanglement, users could send much denser packets of information using the same networks. The research, published today in Nature Photonics, was led by Zhenda Xie, a research scientist in the lab of Chee Wei Wong, a UCLA associate professor of electrical engineering who was the research project's principal investigator. Researchers from MIT, Columbia University, the University of Maryland and the National Institute of Standards and Technology were also part of the team. Albert Einstein famously described quantum entanglement as "spooky action at a distance" because it seems so improbable that what happens to one particle in an entangled pair also happens instantly to the other particle, even over great distances. The phenomenon exceeds the speed of light. In the new study, researchers sent hyperentangled photons in a shape known as a biphoton frequency comb, essentially breaking up entangled photons into smaller parts. In secure data transfer, photons sent over fiber optic networks can be encrypted through entanglement. With each dimension of entanglement, the amount of information carried on a photon pair is doubled, so a photon pair entangled by five dimensions can carry 32 times as much data as a pair entangled by only one. The result greatly extends from wavelength multiplexing, the method for carrying many videos over a single optical fiber. http://phys.org/news/2015-06-method-quantum-entanglement-vastly-photon.html#jCp
Views: 1605 Star News
How Does a Quantum Computer Work?
 
06:47
For more on spin, check out: http://youtu.be/v1_-LsQLwkA This video was supported by TechNYou: http://bit.ly/19bBX5G A quantum computer works in a totally different way from a classical computer. Quantum bits or 'qubits' can exist in a superposition state of both zero and one simultaneously. This means that a set of two qubits can be in a superposition of four states, which therefore require four numbers to uniquely identify the state. So the amount of information stored in N qubits is two to the power of N classical bits. Thank you to Andrea Morello and UNSW. For more info, check out: http://bit.ly/17wZ7lt
Views: 3090409 Veritasium
Scientists Just Broke a Quantum Record; What Happens Next?
 
03:18
Scientists managed to quantum entangle trillions of atoms – here's how. Quantum Teleportation Is Real, Here's How It Works - https://youtu.be/yb38jozeDOs Read more: Stabilized entanglement of massive mechanical oscillators https://www.nature.com/articles/s41586-018-0038-x “Entanglement has a solid theoretical and experimental foundation and is the key resource behind many emerging quantum technologies, including quantum computation, cryptography and metrology” Entanglement "on demand" sets the stage for quantum internet https://newatlas.com/on-demand-quantum-entanglement/55034/ “Researchers at Delft University of Technology have now overcome a major hurdle on the road towards that goal by generating quantum links faster than they deteriorate.” Entangled atoms shine in unison https://phys.org/news/2018-05-entangled-atoms-unison.html “The deliberate entanglement of these quantum particles not only opens up the possibility of building a quantum computer, but also creates the basis for the measurement of physical properties with previously unknown precision.” ____________________ Elements is more than just a science show. It’s your science-loving best friend, tasked with keeping you updated and interested on all the compelling, innovative and groundbreaking science happening all around us. Join our passionate hosts as they help break down and present fascinating science, from quarks to quantum theory and beyond. Seeker explains every aspect of our world through a lens of science, inspiring a new generation of curious minds who want to know how today’s discoveries in science, math, engineering and technology are impacting our lives, and shaping our future. Our stories parse meaning from the noise in a world of rapidly changing information. Visit the Seeker website https://www.seeker.com/videos Elements on Facebook https://www.facebook.com/SeekerElements/ Subscribe now! http://www.youtube.com/subscription_center?add_user=dnewschannel Seeker on Twitter http://twitter.com/seeker Seeker on Facebook https://www.facebook.com/SeekerMedia/ Special thanks to Julian Huguet for hosting and writing this episode of Seeker! Check Julian out on Twitter: https://twitter.com/jhug00
Views: 280887 Seeker
SINGLE AND ENTANGLED PHOTONS: AT THE HEART OF THE QUANTUM REVOLUTIONS Alain Aspect
 
16:53
From the Opening Ceremony of the International Year of Light at the UNESCO building in Paris France. http://spie.org/iyl SINGLE AND ENTANGLED PHOTONS: AT THE HEART OF THE QUANTUM REVOLUTIONS Alain Aspect Institut d‘Optique, Palaiseau and UNESCO Niels Bohr Medal Laureate (France) Alain Aspect is a professor at the Institut d’Optique Graduate School (Augustin Fresnel chair) and at Ecole Polytechnique, in Palaiseau, France, and an emeritus CNRS distinguished researcher at Institut d’Optique. Among his achievements, he made fundamental tests on the foundations of quantum mechanics, developed new methods for cooling atoms with lasers, and is currently working on quantum simulators with ultra-cold atoms. He is member of several Academies of Sciences and has received many awards, among them the CNRS Gold medal (2005), the Wolf Prize in Physics (2010), The Balzan prize on quantum information (2013), the UNESCO Niels Bohr Gold Medal (2013). THE FUTURE OF LIGHT The science of light and its applications in the field of photonics provide many examples of how basic research has yielded both fundamental insights into nature as well as important applications in many different areas of science and technology. This session will see brief presentations on new research directions in both basic science and new technologies, as well as a review of the remarkable success story of light in being recognized by the highest award of the Nobel Prize.
Views: 962 SPIETV
Quantum ‘spookiness' explained
 
03:54
Quantum physics has never made much sense. Einstein never liked the idea that separated particles could influence each other - ‘spooky action at a distance’ - but a new variation on a famous experiment may have proved its existence once and for all. Nature Video dives into a world where quantum entanglement and quantum superposition seem to defy all laws of common sense. Find the full paper on the loophole-free Bell inequality violation here: http://www.nature.com/doifinder/10.1038/nature15759 And read the Nature News coverage here: http://www.nature.com/news/quantum-spookiness-passes-toughest-test-yet-1.18255
Views: 89343 nature video
Quantum cryptography in space (part I)
 
00:45
A brief introduction to the challenge of shrinking a typical laboratory setup for creating entangled pairs of photons for quantum cryptography into a package small enough to fit into a nanosatellite. Learn more about the work of Dr Alexander Ling at the Centre for Quantum Technologies in Singapore: http://quantumlah.org/AlexLinggroup
Lecture 1 | Quantum Entanglements, Part 1 (Stanford)
 
01:35:35
Lecture 1 of Leonard Susskind's course concentrating on Quantum Entanglements (Part 1, Fall 2006). Recorded September 25, 2006 at Stanford University. This Stanford Continuing Studies course is the first of a three-quarter sequence of classes exploring the "quantum entanglements" in modern theoretical physics. Leonard Susskind is the Felix Bloch Professor of Physics at Stanford University. Complete playlist for the course: http://www.youtube.com/view_play_list?p=A27CEA1B8B27EB67 Stanford Continuing Studies: http://continuingstudies.stanford.edu/ About Leonard Susskind: http://www.stanford.edu/dept/physics/people/faculty/sussk... Stanford University channel on YouTube: http://www.youtube.com/stanford
Views: 955959 Stanford
Single-photon detectors - Krister Shalm
 
01:27:49
Krister Shalm of National Institute of Standards and Technologies presented a tutorial: Single-photon detectors at the 2013 QCrypt Conference in August. http://2013.qcrypt.net Find out more about IQC! Website - https://uwaterloo.ca/institute-for-quantum-computing/ Facebook - https://www.facebook.com/QuantumIQC Twitter - https://twitter.com/QuantumIQC
The multi-coloured photons that might change quantum information science
 
01:27
Generation of colour-entangled photon states on a photonic chip and their coherent control via standard telecommunications components. Credit: Benjamin Maclellan More info : http://www.inrs.ca/english/actualites/multi-coloured-photons-might-change-quantum-information-science
NEW RESULTS! Cosmic Quantum Bell Test
 
11:19
Try 23andMe at http://23andme.com/physicsgirl Original paper: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.060401 How do you test quantum mechanics with ancient stars? A new experiment aims to close loopholes to the iconic "Quantum Bell Test", with new results published in Feb. 2017! Creator/host: Dianna Cowern Animator: Kyle Norby Writer: Sophia Chen Editor: Jabril Ashe instagram.com/thephysicsgirl facebook.com/thephysicsgirl twitter.com/thephysicsgirl physicsgirl.org Paper: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.118.060401 Photo of detector thumbs-up and quantum receiver apparatus photo: Thomas Scheidl Guth/Zeilinger/Kaiser photo: Ari Daniel Cosmic Bell Group photo: Courtesy Dave Kaiser Music: APM and YouTube
Views: 269990 Physics Girl
Unbreakable Quantum Entanglement
 
04:18
Einstein‘s „spooky action at a distance“ persists even at high accelerations, researchers of the Austrian Academy of Sciences were able to show in a new experiment. A source of entangled photon pairs was exposed to massive stress: The photons‘ entanglement survived the drop in a fall tower as well as 30 times the Earth’s gravitational acceleration in a centrifuge. This was reported by IQOQI Vienna in the most recent issue of „Nature Communications“. This kind of experiments helps deepen our understanding of quantum mechanics and at the same time gives valuable results for quantum experiments in space. Link to full article: http://www.iqoqi-vienna.at/news-detail/article/unbreakable-quantum-entanglement/
Views: 1448 IQOQI Vienna
Entanglement Theory may Reveal a Reality we can't Handle
 
05:58
What is entanglement theory? It is a Mystery, and here is a potential solution. But its implications are so paradigm shattering that most scientists refuse to believe it. Maybe we can't handle the truth? Imagine you found a pair of dice such that no matter how you tossed them, they always added up to 7. Besides becoming the richest man in Vegas, what you would have there is something called an entangled pair of dice. You could now separate these entangled dice. You could have your friend Alice take one of these to Macau, while the other one stays with you in Las Vegas. And as soon as you rolled your dice, the other one would always instantly show a number that added up to 7. Since this happens instantly, did your dice communicate at faster than speed of light to Macau? Scientists can create entangled photons, for example, by shining a laser on a nonlinear optical crystal. The Entanglement means that a pair of photons act like a single entity rather than two separate particles. To understand entanglement better, you first have to accept the fact that at the quantum scale, reality is fuzzy. Reality really doesn’t know what it is, until it is measured. This is like a single dice tossed in the air that doesn’t have a distinct face until it lands. When tossed up, it is 1, 2, 3, 4, 5, and 6 all at once. Quantum particles are similar in that they do not have distinct properties until they are measured. Particles such as a photon exists in all possible states simultaneously. But when it is measured, it is in only one state. And if the photon is entangled, this measurement of one particle causes its entangled pair to simultaneously exhibit the opposite state, no matter what the distance is between them. Einstein disliked this idea of one particle influencing the other over long distances so much, he called it “spooky action at a distance.” Einstein believed that the particles carried information about each other at the moment that they were entangled and were close to each other. He thought the properties of both particles were determined locally and carried along from the beginning. So in Einstein’s view, the two dice "knew" what they would show before they were tossed. But in the quantum world, this is impossible, because particles are fuzzy until measured. In 1964 the Irish physicist John Bell devised a test that actually could prove whether information was encoded within the entangled particles or whether the spooky action at a distance was real. He did this by taking advantage of the fact that in QM, measurement affects the thing you are measuring. If information was encoded at the time of particle creation, as Einstein believed, then nothing we do randomly to one particle should affect the other. And what this test found conclusively proved that Quantum mechanics is correct – that Einstein was wrong, and that spooky action at a distance does in fact take place. So are entangled particles communicating instantaneously? Even if the speed was 5 miles per hour faster than the speed of light, it would violate Einstein’s theory of relativity and our picture of reality would completely collapse if this was the case. So most scientists have come to the conclusion that no faster than light communication is taking place. So if no signal is telling these particles how to coordinate their results, what’s going on? There is another real possibility that is not popular among scientists, but that Bell himself proposed, and that is called superdeterminism. And here is how it could solve the mystery of entanglement: Bell proposed the idea of absolute determinism in the universe, the complete absence of free will. Suppose everything in reality is predetermined. It cannot be changed. The reality that you live in has already happened. No matter what you say or do, there is no free will. Our behavior and decisions, including our belief that we are free to choose to do one experiment rather than another, is absolutely predetermined. If this is the case, the mystery disappears. There is no need for a faster-than-light signal to tell particle A what measurement has been carried out on particle B, because the universe, including particle A, already 'knows' what that measurement will be. It is predetermined. Could this be the real reality?
Views: 14192 Arvin Ash
Practical Quantum Cryptography and Possible Attacks
 
57:51
Google Tech Talks January, 24 2008 ABSTRACT Quantum cryptography is actually about secure distribution of an encryption key between two parties. In this talk I give an introduction to practical quantum cryptography. I will describe the technical details of a few implementations, how the security of the distributed key might be compromised, and what steps can be taken to prevent this. Speaker: Alexander Ling Alexander Ling is a graduate student with the Experimental Quantum Optics group in the Center for Quantum Technologies in Singapore. He has spent the last four years building sources of high-quality polarization-entangled photon-pairs. The entangled light is then used for various things like testing the validity of quantum mechanics and quantum key distribution. He hopes to complete his Ph.D. in 4 months.
Views: 17373 GoogleTechTalks
China to launch unbreakable quantum satellite
 
03:46
Satellite produces entangled photon pairs which form an encryption key These photons will theoretically remain linked over great distances This means that any attempts to listen in will be detected on the other side Scientists say this could one day make for a secure global network
Views: 11365 TECH-TUBE
Nobel Prize in Physics 2012 : Quantum Entanglement
 
02:25
The 2012 Nobel Prize in Physics was awarded to French scientist Serge Haroche and American scientist David Wineland for finding ways to manipulate and measure quantum states without destroying them. Using superconducting atomic traps and single microwave photon pulses, through the power of Quantum Electrodynamics, or QED, it is possible to entangle the photon with the trapped atoms in a cavity and measure the quantum system as it evolves; measuring the photon from creation to annihilation. This process, in effect, "freezes" light itself and allows the quantum mechanical system to be studied under controlled operations. An immediate application of this would be a super-accurate clock, that would be even more accurate than today's atomic clocks. Moreover it is possible to make such measurements without destroying the photons, providing quantum feedback allowing for net gain for a bit of information making quantum bits, or qubits, which is another possible function of the technology used in these experiments. Such technology would revolutionise computing, as qubits allow for simultaneous calculations, multitasking of computations and would allow many-body solutions to some problems in physics and chemistry. If a Quantum computer could be constructed, molecules could be modelled on only a few quantum bits. Likewise, weather patterns and chaotic systems could also be modelled with minimal processing power. Experimentally it is challenging but that is why it is so important to have scientists paving the way for further development. Ultimately, this work could make it possible to build a new kind of computer far more powerful than what normal technology can achieve.
Views: 14127 Muon Ray
What is Quantum Mechanical Spin?
 
08:44
This video extends How Do Quantum Computers Work: http://youtu.be/g_IaVepNDT4 Prof. Morello explains why spin does not mean the particle is actually spinning. Subatomic particles like the electron, neutron, and proton have spin, which means they act like tiny bar magnets. This can be used in quantum computing applications. We thank the UNSW School of Physics Demonstration Unit for providing the double pendulum.
Views: 378393 2veritasium
What can Schrödinger's cat teach us about quantum mechanics? - Josh Samani
 
05:24
View full lesson: http://ed.ted.com/lessons/what-can-schrodinger-s-cat-teach-us-about-quantum-mechanics-josh-samani The classical physics that we encounter in our everyday, macroscopic world is very different from the quantum physics that governs systems on a much smaller scale (like atoms). One great example of quantum physics’ weirdness can be shown in the Schrödinger's cat thought experiment. Josh Samani walks us through this experiment in quantum entanglement. Lesson by Josh Samani, animation by Dan Pinto.
Views: 1045808 TED-Ed
Quantum cryptography for space (part 3)
 
00:23
There's a limit to how far you can send entangled photons through optical fibres or the atmosphere without them getting lost or losing their quantumness. Putting a source on a satellite is one route to extend the distance over which you can do quantum cryptography, as this very short video illustrates. Learn more about the work of Dr Alexander Ling at the Centre for Quantum Technologies in Singapore: http://quantumlah.org/AlexLinggroup
Quantum Optics – Weak light pulses on a beam splitter
 
09:07
One-photon based quantum technologies In this lesson, you will discover two quantum technologies based on one photon sources. Quantum technologies allow one to achieve a goal in a way qualitatively different from a classical technology aiming at the same goal. For instance, quantum cryptography is immune to progress in computers power, while many classical cryptography methods can in principle be broken when we have more powerful computers. Similarly, quantum random number generators yield true random numbers, while classical random number generators only produce pseudo-random numbers, which might be guessed by somebody else than the user. This lesson is also an opportunity to learn two important concepts in quantum information: (i) qubits based on photon polarization; (ii) the celebrated no-cloning theorem, at the root of the security of quantum cryptography. Learning Objectives • Apply your knowledge about the behavior of a single photon on a beam splitter to quantum random number generators. • Understand the no-cloning theorem • Understand and remember the properties of q qubit This course gives you access to basic tools and concepts to understand research articles and books on modern quantum optics. You will learn about quantization of light, formalism to describe quantum states of light without any classical analogue, and observables allowing one to demonstrate typical quantum properties of these states. These tools will be applied to the emblematic case of a one-photon wave packet, which behaves both as a particle and a wave. Wave-particle duality is a great quantum mystery in the words of Richard Feynman. You will be able to fully appreciate real experiments demonstrating wave-particle duality for a single photon, and applications to quantum technologies based on single photon sources, which are now commercially available. The tools presented in this course will be widely used in our second quantum optics course, which will present more advanced topics such as entanglement, interaction of quantized light with matter, squeezed light, etc... So if you have a good knowledge in basic quantum mechanics and classical electromagnetism, but always wanted to know: • how to go from classical electromagnetism to quantized radiation, • how the concept of photon emerges, • how a unified formalism is able to describe apparently contradictory behaviors observed in quantum optics labs, • how creative physicists and engineers have invented totally new technologies based on quantum properties of light, then this course is for you. Subscribe at: https://www.coursera.org
Views: 219 intrigano
Quantum Entanglement and the Great Bohr-Einstein Debate | Space Time | PBS Digital Studios
 
14:03
For those of you in New York City you can check out Matt live at PBS Nerd Night at the NYC YouTube Space on Thursday night September 22nd. Hope to see you there. to.pbs.org/nerdnight Albert Einstein strongly disagreed with Niels Bohr when it came to Bohr’s interpretation of quantum mechanics. Quantum entanglement settled the argument once and for all. Get your own Space Time t­shirt at http://bit.ly/1QlzoBi Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g Previous Episode - Self-Replicating Robots and Galactic Domination https://www.youtube.com/watch?v=4H55wybU3rI Veritasium’s video Quantum Entanglement and Spooky Action at a Distance at 7:36 https://www.youtube.com/watch?v=ZuvK-od647c How the Quantum Eraser Rewrites the Past at 8:41 https://www.youtube.com/watch?v=8ORLN_KwAgs Einstein argued that elementary particles maintained their intrinsic values whether they were being observed or not. Bohr believed that in observing such particles we collapsed a wave function of probabilities. He asserted that it is only when these wave functions collapse that one of many probabilities is chosen and the particles take on distinct values. Quantum entanglement, John Stewart Bell and Alain Aspect eventually proved that Bohr was correct. Written and hosted by Matt O’Dowd Produced by Rusty Ward Made by Kornhaber Brown (www.kornhaberbrown.com) Comments: Borne Stellar https://www.youtube.com/watch?v=4H55wybU3rI&lc=z13kddtono20c1h2g22kx1brstvvsthus Strofi Kornego https://www.youtube.com/watch?v=4H55wybU3rI&lc=z12vh34b2l2uxvagy04cg5swtqf0s3gb1o00k Daniel Oberley https://www.youtube.com/watch?v=4H55wybU3rI&lc=z12rsv2yszi5td21w22aytvhxvagg1giz04
Views: 1461459 PBS Space Time
Prof. Dr. Anton Zeilinger speaks on quantum physics at UCT
 
50:45
Prof. Dr. Anton Zeilinger speaks on quantum physics at UCT. Professor Zeilinger is one of the world’s leading quantum physicists. He works both on theoretical and experimental foundations of quantum physics, and a primary focus of his research is entanglement, the deep connectedness of distant systems. He started the field of multi-particle entanglement, which became a crucial ingredient for any future quantum computer. He carried out the first entanglement-based quantum communication, the first quantum teleportation, the first experimental quantum teleportation and the first quantum cryptography with entangled photons. These groundbreaking achievements contributed significantly to a new understanding of fundamental issues in the interpretation of quantum mechanics, where information is the central theme. Another focus of his work has been to investigate quantum features of large particles and the transition between quantum mechanics and classical physics. Zellinger made the first experimental demonstration of quantum interference of Buckminster-Fullerenes and biologically relevant macromolecules. He is currently studying the quantum behavior of real mechanical systems, such as mechanical oscillators (micro-mirrors).
Views: 754 Quantum Healing
24. Entanglement — QComputing, EPR, and Bell
 
01:22:45
MIT 8.04 Quantum Physics I, Spring 2013 View the complete course: http://ocw.mit.edu/8-04S13 Instructor: Allan Adams In this lecture, Prof. Adams discusses the basic principles of quantum computing. No-cloning theorem and Deutsch-Jozsa algorithm are introduced. The last part of the lecture is devoted to the EPR experiment and Bell's inequality. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
Views: 64153 MIT OpenCourseWare
CHINA’S Claims it has ‘QUANTUM’ Radar may leave $17 Billion F-35 Naked
 
07:58
QUANTUM QUANDARY The new sensor technology uses concepts on the edge of Australia's scientific understanding. And a Chinese state-owned technology group late last year declared it had mastered it. The new technology had "important military application values" because it could identify aircraft and ships "invisible" to conventional radar systems, a press statement read. Understanding that technology exposes its full potential. A photon is a particle with wavelike properties that carries energy without mass. We usually hear of it in terms of light, but it is the basis of all electromagnetic radiation. Where radar sends out a beam of photons as radio waves, quantum radar uses entangled photons. Put simply, entangled photons are two separate photons that share a deep quantum link. The upshot is the photons mirror each other's behavior when one of them is influenced in some way. DELVE DEEPER: War Games Explore A War with China In terms of radar, a crystal can be used to 'split' such entangled photons and cast one into the sky. For a time at least, the twin photons retain their 'spooky' link - mirroring the same responses to the environment the other encounters. It's a quirk of quantum physics which strained the understanding of Albert Einstein when he grappled with the idea in the 1930s. Quantum radar would send out bursts of photons while retaining their 'pairs'. The changes in behavior of the retained photon would then reveal what's happening to the photon in the beam. Ultimately, the point is the same: the entangled photons bounce back to a sensor which can then compute course, speed and size. But the use of tangled photons has a second major benefit over radio waves. It's not likely to be jammed. UNBREAKABLE LOCK Apart from absorbing or reflecting away its radio beams, conventional radar can also be jammed by transmitting 'white noise' on the same frequencies. This isn't possible with entangled photons. While the photons are separated by their beam, they retain their quantum link. Attempting to break that link would be a giveaway. And any attempt to distort the behavior of one of the pair would be equally noticeable. The same applies to advanced materials. Where modern composites can 'trap' radio waves within their molecular structure, whatever happens to an entangled photon would be replicated - and measured - in its paired mate back at the radar site. HYPOTHETICAL? And different materials affect protons in different ways. Because of this, analysts say quantum radar could ultimately be capable of determining what an aircraft is made of - or even carrying. At one level this would eliminate the effectiveness of decoys. At another, it could identify which aircraft - or missile - is carrying nuclear warheads. And, unlike existing radar, their transmissions would not be detectable. Any stealth aircraft would not know it had been 'seen'. =================================================== DISCLAIMER: Information, Facts or Opinion expressed in this Video are Presented as Sources and do not reflects views of INDIA TUBE and hence INDIA TUBE is not liable or responsible for the same. The Sources are responsible for accuracy, Completeness, suitaibility and Validity of any information in this Documentary. SOURCES: syndicate FOLLOW US ON FACEBOOK: https://www.facebook.com/indiatubedesk TWITTER Link: https://twitter.com/indiatubedesk ==================================================== THANKS FOR WATCHING, PLEASE LIKE SHARE AND SUBSCRIBE TO THE INDIA TUBE ====================================================
Views: 86068 India Tube Defence